Spark plug



Aug. 127, 1940. M. BECKETT 2,212,393

S PARK PLUG Filed may 4. 1939 .Fgl.

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ATTORNEYS.

Patented Aug. 27, 1940 UNITED STATES PATENT OFFICE 2,212,893 SPARK PLUG Milton Beckett, Bridgeton, N. J. Application May 4, 1939, Serial No. 271,788

7 I 1 Claim. This invention relates to spark plugs, one of the objects being to provide a removable member carrying the points of the device so that these can be renewed readily without loss of the remaining portions of the spark plug. I

With the foregoing and other objects in view which will appear asthe description proceeds,

the invention consists of certain novel details of construction and combinations of parts hereinafter'more fully described and pointed out in 1' the claim, it being understood that changes may be made in the construction and arrangement ofparts without departing from the spirit of the invention as claimed.

In the accompanying drawing the preferred form 01' the invention has been shown.

In said drawing: Figure l is a view partly in section and partly in elevation showing the present improvements. Figure 2 is a similar view in which the sectional core is shown mainly in section.

Figure 3 is an end elevation. 7 Referring to the figures by characters of reference, I designates the body of the plug having one end reduced and screw threaded as at 2 while its other end is provided with a counterbore 3 having a screw threaded wall 4 and an inner annular shoulder 5.

The core of the spark plug is ior med 01' an outer section 6 and an inner section 'I.' The inner section includes a metal bushing 8 having slits 8 extending thereinto from one end while its other end has an annular flange III so shaped and proportioned as to flt snugly on shoulder 5 85 while the bushing is seated firmly in the reduced end portion 2 of the plug. A core section II of porcelain or the like is fitted securely in the bushing and carries a central electrode I2 both ends or which are exposed beyond the respective 4o ends '0! the core II while oneiof said ends, I3, constitutes one of the points ot the spark plug. The other point It is -made' integral with the bushing 8 and is extended close to point I3 so as to provide the necessary spark gap. Core section 6 is of porcelain or the like and is insertable into counterbore 3 where an annular rib I5 seats on the flange l0 and serves to clamp it firmly onto shoulder 5. A conductor I8 is extended through the core section 6 and is adapted to hear at one end against electrode I 2 5 while its other end is exposed for connection with the ignition circuit.

A threaded sleeve II extends snugly around core section 6 and is insertable into the counterbore 3 where it is adapted to engage the 10 threads 4 so as to hold section 6 tightly in place.

Should the points become burned or require removal for any other reason, it is necessary solely to unscrew sleeve I'I. Core section 6 can then be lifted from plug I after'which section 1 1 can be pushed out of the plug I and another section substituted. Section 6 and sleeve II are then replaced and the spark plug is again ready for use.

The slits 9 permit free relative expansion of 20 the porcelain section II and the bushing 8, when heated.

What is claimed is:

A spark plug including a body having 'a counterbore extending into one end and ter- 25 minating at an annular shoulder, a. core section including a bushing removably seated in the body'and having slits extending thereinto from one end, a flange on the bushing removably seatedon the shoulder, an insulator seated in 30 the bushing and having flat ends, an electrode anchored in the insulator and projecting therefrom at its ends, one end constituting a point, a point extending from the bushing, a second section of insulating material removably seated 36 in the counterbore and having a flat end overlying the bushing and the insulator therein, adjustable means engaging the body for holding said section seated upon the flange to clamp said flange 'on the shoulder, and a conductor extend 4o ing through saidsecond section and exposed at, one end for contact with one end of said electrode at a point between the ends 01 the two insulating sections.

lldlLTON BECKETI'. 

